Reflective Electrode Display Panel for Fingerprint Recognition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display panels have a low success rate for fingerprint recognition due to incomplete irradiation of fingerprint signal light to the recognition unit, resulting in reduced light utilization and recognition accuracy.
Innovation Solution
Incorporating a first reflecting layer on the reflective electrode facing the fingerprint recognition assembly, which reflects light not initially irradiated to the recognition unit, allowing for secondary reflection and increased light utilization by the fingerprint recognition unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional display panel structure is used without additional reflecting layers, then the device complexity is low, but the light utilization rate for fingerprint recognition is insufficient
Solution Approach 1:
The patent combines the fingerprint recognition function with the display panel structure by integrating a first reflecting layer and a second reflecting layer into the existing display panel architecture. The first reflecting layer is positioned between the fingerprint recognition unit and the light-emitting unit, while the second reflecting layer is positioned between the fingerprint recognition unit and the base substrate. This merging approach allows the display panel to perform both display and fingerprint recognition functions without requiring completely separate systems, thereby improving light utilization while controlling device complexity.
Solution Approach 2:
The patent introduces additional dimensional elements by adding reflecting layers at different positions within the display panel structure. The first reflecting layer reflects light upward toward the fingerprint recognition unit, while the second reflecting layer reflects light downward. This multi-dimensional light reflection approach ensures that fingerprint signal light is directed toward the recognition unit from multiple directions, improving light utilization rate without simply increasing the footprint area.
2Reliability
If light-emitting units operate at high brightness for fingerprint recognition, then the fingerprint recognition success rate improves, but the service life of light-emitting units decreases
Solution Approach 1:
The patent introduces reflecting layers as intermediary elements between the light-emitting units and the fingerprint recognition unit. These reflecting layers act as mediators that redirect light paths, ensuring that fingerprint signal light is efficiently directed toward the recognition unit. This intermediary mechanism improves recognition success rate without requiring the light-emitting units to operate at excessively high brightness levels, thereby preserving their service life.
3Area of stationary object
If the fingerprint recognition area is disposed in the display area, then the screen ratio is improved, but the light utilization rate for fingerprint recognition becomes insufficient
Solution Approach 1:
The patent segments the light reflection function into multiple distinct reflecting layers positioned at different locations within the display panel. The first reflecting layer is positioned closer to the light-emitting unit, while the second reflecting layer is positioned closer to the base substrate. This segmentation allows each layer to handle specific light reflection tasks, ensuring efficient light utilization for fingerprint recognition while maintaining the integrated display-area placement that achieves high screen ratio.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the light utilization rate and success rate of fingerprint recognition by ensuring more fingerprint signal light is received by the recognition unit, while also reducing the brightness of light-emitting units to prolong their service life.
Implementation Method 1
a first reflecting layer disposed on one side of the reflective electrode facing to the fingerprint recognition assembly, where the first reflecting layer includes at least one first reflecting unit
Implementation Method 2
reflected light formed after the reflection of the first reflecting unit is reflected by the reflective electrode of a light-emitting unit for a second time
Data Source
AI summary
Provided are a display panel and a display device. The display panel includes a display assembly, which includes a base substrate and a plurality of light-emitting units disposed on one side of the base substrate, where each of the plurality of light-emitting unit includes a reflective electrode; a fingerprint recognition assembly, which is disposed on one side of the reflective electrode facing away from a light emitting surface of the light-emitting unit, and includes at least one fingerprint recognition unit which is configured to perform fingerprint recognition; and a first reflecting layer, which is disposed on one side of the reflective electrode facing to the fingerprint recognition assembly and includes at least one first reflecting unit, where at least part of a vertical projection of the first reflecting unit on a film layer where the fingerprint recognition unit is located is in an area other than the fingerprint recognition unit.